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Bureau of Mines Information Circular/1987 




Fire Doors for Noncoal Mines 



By Kenneth L. Bickel and William H. Pomroy 




UNITED STATES DEPARTMENT OF THE INTERIOR 




Information Circular 9165 

•A 



Fire Doors for Noncoal Mines 



By Kenneth L. Bickel and William H. Pomroy 



UNITED STATES DEPARTMENT OF THE INTERIOR 
Donald Paul Hodel, Secretary 

BUREAU OF MINES 

David S. Brown, Acting Director 



y 




0- 



Library of Congress Cataloging in Publication Data: 



Bickel, Kenneth L. 

Fire doors for noncoal mines. 

(Information circular/United States Department of the Interior, Bureau of Mines; 9165) 

Bibliography: p. 22 

Supt. of Docs, no.: I 28.27: 9165. 

1. Mine safety — Equipment and supplies. 2. Doors. I. Pomroy, William H. II. Title. III. 
Series: Information circular (United States. Bureau of Mines); 9165. 



TN295.U4 



622'.8 



87-600231 



CONTENTS 

Page 

Abstract 1 

Introduction 2 

Analysis of mine doors^ currently in use 2 

Door descriptions and operating characteristics 2 

Assessment of the suitability of each door type for use as a mine fire door.. 3 

Improved fire-door design and testing 5 

First-generation fire door 5 

Second-generation fire door 12 

I Third-generation fire door 12 

In-mine test 19 

Summary and conclusions 21 

References 22 

Appendix. — Shop drawings of improved fire-door designs Pocket 

ILLUSTRATIONS 

1. Fire-door air-pressure test fixture showing door assembly and fan 6 

2. Fire-door air-pressure test fixture showing airbag 6 

3. Fire-door fire-test frame with fire door installed 8 

4. Fire-door fire-test fixture showing gas ports and thermocouples 9 

5. Standard time-temperature curve for fire-door testing 10 

6. Technician measuring door deflections during fire test 11 

7. Door deflection caused by exposure to test fire 13 

8. Second-generation fire door undergoing fire test 14 

9. Second-generation fire door after removal from fire-test fixture 14 

10. Third-generation fire-door fabrication showing thermal insulation blanket. 16 

11. Third-generation fire-door mockup testing 17 

12. Thermocouples arrayed on downfire side of fire door during fire testing... 18 

13. Average surface temperatures of unexposed door panels during fire test of 

third-generation mine fire door 19 

14. Fire exposure side of third-generation fire door after removal from the 

fire-test fixture 20 

15. Artist's rendering of fire door installed in underground mine 21 

TABLES 

1. Advantages and disadvantages of each door type 4 

2. Door deflection under conditions of pressure differential of 6-in w.g 7 



UNIT 


OF MEASURE ABBREVIATIONS USED IN THIS 


REPORT 


°F 


degree Fahrenheit min 


minute 


ft 


foot pet 


percent 


f t/min 


foot per minute s 


second 


ft 3 /min 


cubic foot per minute st 


short ton 


h 


hour yr 


year 


in 


inch 





FIRE DOORS FOR NONCOAL MINES 

By Kenneth L. Bicker and William H. Pomroy 2 



ABSTRACT 

During an underground mine fire, the importance of controlling the 
spread of smoke and toxic gases with suitable ventilation structures has 
been proven. However, under certain conditions, control of the propaga- 
tion of the fire itself may be even more critical in insuring a safe 
mine evacuation. Fire doors offer the means for accomplishing both ob- 
jectives. In 1978, the Bureau of Mines initiated research to evaluate 
the state of fire-door technology and develop and test a fire door suit- 
able for large openings (10 by 12 ft or larger) in noncoal underground 
mines. 

This report discusses current fire-door technology in the context of 
the underground mine environment and the design, fabrication, lab test- 
ing, and in-mine field testing of a mineworthy fire door. This door has 
a 1. 5-h fire resistance rating and limits temperature rise across the 
door to 250° F during the first 30 min of fire exposure. 



'Mining engineer. 
^Group supervisor. 
Twin Cities Research Center, Bureau of Mines, Minneapolis, MN. 



INTRODUCTION 



From 1965 to 1984, 177 noncoal under- 
ground mine fires were reported to Fed- 
eral mine safety authorities, and about 
90 pet of the 121 fatalities resulting 
from these fires were caused by exposure 
to smoke and toxic gases (1_)« 3 The con- 
trol of smoke and gases during an under- 
ground mine fire is critically important. 
Under certain conditions, however, con- 
trolling the propagation of the fire it- 
self may be even more critical in insur- 
ing a safe mine evacuation. Fire doors 
are a practical means for limiting the 
spread of toxic combustion products and 
controlling fire propagation. Because of 
the value of fire doors, recent Federal 
mine safety regulations include require- 
ments for installing them in specified 
areas. Although these regulations permit 
alternatives to fire doors under certain 
circumstances (routing air directly to an 
exhaust system, mechanical ventilation 
reversal, effective evacuation, or in- 
stallation of an automatic fire- 
suppression system), fire doors are often 
preferred due to factors such as mine 
layouts, operating practices, and venti- 
lation plans. However, because no design 
guidelines or construction specifications 
for mineworthy fire doors for large 



underground openings were available, the 
fire-door option was not feasible for 
many mines. 

In 1978, the Bureau of Mines initiated 
a research and development contract to 
evaluate the state of fire-door technol- 
ogy and develop and test a fire door . 
suitable for large openings in noncoal 
underground mines. These research re- 
sults were intended to guide subsequent 
development efforts by door manufactur- 
ers, eventually resulting in commercial ; 
products. Some mines may also wish to ■ 
develop workable designs on their own. 
Shop drawings of each door are included 
in the appendix of this report. 

Initial phases of the research are de- 
scribed in detail in a progress report 
submitted to the Bureau by the 
contractor, Unidynamics, Inc. ^2)» Re- - 
suits of these initial phases are also 
summarized in a previous Bureau report 
(_3) and are briefly highlighted in this 
report. Because the contract was termi- 
nated prior to completion results of 
later phases of the contract, and subse- 
quent efforts by Bureau personnel to 
complete the program, have not been 
previously reported. 



ANALYSIS OF MINE DOORS CURRENTLY IN USE 



The study was initiated by determining 
the types of doors currently in use in 
underground mines. The five categories 
included — 

1. roll doors. 

2. swing doors with panels opening in 
the same direction. 

3. swing doors with panels opening in 
opposite directions. 

4. telescoping doors. 

5. sliding doors. 

Most doors were operated either electri- 
cally or by compressed air. Of the five- 
door types encountered underground, only 

^Underlined numbers in parentheses re- 
fer to items in the list of references at 
the end of this report. 



two (roll doors and sliding doors) were 
rated. Each door was held open by a fus- 
ible link that would melt during a fire, 
allowing gravity to close the door. Of 
the five door types studied, only three 
(roll doors, telescoping doors, and swing 
doors with panels opening in opposite 
directions) were observed in current mine 
use in the desired size range (10 by 12 
ft or larger), however, all door types 
are discussed in detail below. 

DOOR DESCRIPTIONS AND OPERATING 
CHARACTERISTICS 

Roll doors, sometimes referred to as 
roll-down doors, consist of a series of 
horizontal metal slats, which are inter- 
locked to allow them to roll around a 
metal shaft when the door is opened 



■: 



Li 

h 



(raised vertically), with little air 
leakage between the slats when the door 
is closed. The doors are electrically 
operated and controlled by pushbutton or 
lanyard. 

Swing doors with panels opening in the 
same direction are generally designed so 
that two air cylinders, one connected to 
each panel, are operated in tandem to 
open the door. Swing doors with panels 
opening in opposite directions are gen- 
erally designed so that the panels are 
connected by a linkage and operated by a 
single air cylinder. The doors are con- 
trolled by a lanyard located away from 
the door or by the use of photoelectric 
cells triggered by a passing vehicle. 

The telescoping door consists of a 
series of horizontal, channel-shaped 
sheet metal sections that stack on each 
other. As the lowest section is lifted 
by two cables wound on a drum, it nests 
into the next section directly above it 
and lifts it also. This process con- 
tinues until all sections have been 
lifted and the door is open. The door is 
electrically operated and controlled by 
pushbutton or lanyard. 

The sliding door consists of a door 
panel fitted with rollers on top. The 
rollers ride in a horizontal track above 
and parallel to the plane of the door 
opening. The door is generally opened 
and closed manually. The door can be 
made self-closing by slightly inclining 
the track. 

ASSESSMENT OF THE SUITABILITY OF EACH 
DOOR TYPE FOR USE AS A MINE FIRE DOOR 

Each door type was analyzed with re- 
spect to the requirement for a mine- 
worthy, 1.5-h rated fire door for large 
mine openings. The advantages and dis- 
advantages of each door type are given in 
table 1. 

Although some rated roll doors had been 
observed in mine use, general-purpose 
application of this door type throughout 
the noncoal mining industry was judged 
impractical due to its susceptibility to 
blast, mobile equipment, and ground move- 
ment damage. Such damage could render 
the door inoperable. Smoke leakage or 
fire propagation would be experienced if 



the door were stuck in the "up" position 
during a fire, and passage of escaping 
miners would be inhibited if the door 
were stuck in the "down" position. 

The primary deficiency of swing doors 
with panels opening in the same direction 
is the difficulty encountered in opening 
(or closing) the panels against a high 
ventilation pressure. Even in mines 
with relatively low pressure differen- 
tials, high pressures can be created by a 
fire. During a fire, airflows can be re- 
versed, greatly altering the opening and 
closing characteristics of a door from 
normal conditions. 

The disadvantages of swing doors with 
panels opening in opposite directions are 
minor. Although debris on the floor may 
hinder door operation, this is seldom a 
problem in the many mines that now use 
this type door for ventilation control. 
Likewise, although a floor trough is 
required to accommodate a bottom linkage 
for some designs, most do not, and since 
a concrete bulkhead and threshold are 
often installed in door openings anyway, 
the requirement for a floor trough would 
add little cost or complexity to an 
installation. 

Like the slats of a roll door, the sec- 
tions of a telescoping door are suscep- 
tible to damage from ground movement, 
blasting, and passing vehicles. Mis- 
alignment of the track or bent door sec- 
tions could render the door inoperable. 
As with the roll door, smoke leakage or 
fire propagation could be experienced if 
the door became stuck in the "up" posi- 
tion, and escaping miners could be pro- 
hibited from, passing if the door were 
stuck in the "down" position. 

The principal disadvantage of the slid- 
ing door is that an area alongside the 
door opening, large enough to accommodate 
the door panel, is required. In large 
openings (20 to 30 ft is not unusual), an 
area of this size would be quite costly 
to excavate. Also, the difficulty in 
achieving an effective seal around the 
door edges, which is characteristic of 
sliding doors, is much more pronounced as 
the area of the door increases. 

Based on the foregoing assessment and 
the information in table 1, the swing 
door with panels opening in opposite 



TABLE 1. - Advantages and disadvantages of each door type 



„ 



Door Typ e 



Advantages 



Disadvantages 



Roll doors.. 



Swing doors 
with panels 
opening in 
same 
direction. 



Swing doors 
with panels 
opening in 
opposite 
directions. 



Telescoping 
doors. 



Sliding 
doors. 



Raises and lowers vertically; not 
susceptible to damage from debris 
on roadway (however, debris may 
impair a bottom seal). 

Channels on either side of door. 

Complete door and operating mecha- 
nism mountable on bulkhead. 



Very rugged. 
Adjustable opening 
speed. 



and closing 



Air pressure differential across 
door opening has little effect on 
power required to open and close 
doors and makes sealing around 
edges simpler. 

Very rugged. 

Doors can be set at desired open- 
ing and closing speed. 

Raises and lowers vertically; not 
susceptible to damage from debris 
on roadway (however, debris on 
floor may prevent bottom seal). 

Channels on either side of door 
provide good air seal. 



The door panel or panels can be 

setup on an inclined track to 

provide self-closing. 
Air pressure has little effect on 

the opening or closing force 

required. 



Space required above door to house 
operating mechanism and door. 

Constructed of sheet metal; suscep- 
tible to damage from ground move- 
ment, equipment, and blasting. 

Slight misalignment of channels 
and/or slats may render door 
inoperable. 

Maintenance and lubrication re- 
quired so corrosion does not 
render door inoperable. 

In large openings or high differen- 
tial pressures, the door may de- 
flect excessively, rendering it 
inoperable. 

A high-pressure differential across 
the door could make opening and/or 
closing door difficult or impossi- 
ble and sealing around door 
perimeter difficult. 

Debris on the floor may prevent 
door from closing. 

Two air cylinders are generally re- 
quired to operate door. Where 
possible to mount an air cylinder 
on mine roof, one air cylinder can 
be used with a rod connected to 
top of each panel. 

Debris on floor may prevent door 
panels from closing properly. 

Some designs required a floor 
trough to accommodate a bar link- 
age at bottom of door. 



Susceptible to damage from equip- 
ment, blasting, and ground 
movement. 

Space required above door to store 
raised door sections and house op- 
erating mechanism. 

Contains many separate pieces, all 
of which must fall into place by 
gravity for door to operate. 

An area alongside each opening 
large enough to accommodate door 
is required. 

Difficult to achieve effective seal 
around door edges. 



: 



- 



k 



directions was determined to be best 
suited for use as an underground mine 
fire door. However, since no such door 
had ever been tested or rated for the de- 
sired 1.5-h fire resistance, appropriate 
door design criteria and construction 



specifications were unknown. It was 
therefore determined that a design for 
such a door should be developed and that 
the design should be verified by subject- 
ing a prototype door to a 1.5-h fire 
resistance test. 



IMPROVED FIRE-DOOR DESIGN AND TESTING 



Design criteria for the improved fire 
door were established as — 

1. Type: The swing door with panels 
opening in opposite directions was se- 
lected because the design allows air 
pressure to be balanced on the panels, 
and because it can be ruggedly built. 

2. Size: The maximum size door that 
will fit into the fire-door test fixture 
at Underwriter's Laboratories (UL) is 12 
by 10 ft. (Larger door sizes may be 
approved by UL based on fire testing of 
doors up to 12 by 10 ft followed by addi- 
tional analysis. ) 

3. Long-life: The door was designed 
to last for over 200,000 cycles, or for 
at least 5 yr. 

4. Fire rating: A fire-door rating of 
1.5 h was specified. 

5. Means of operation: Compressed 
air. 

6. Design pressure differential: 6- 
in-w.g. pressure differential across the 
door with higher pressure ratings 
possible. 

FIRST-GENERATION FIRE DOOR 

The first-generation fire door con- 
sisted of 11-gauge sheet steel welded to 
a steel frame, with steel strip horizon- 
tally welded to the face of the door for 
reinforcement. Neoprene door seals were 
used for sealing around the perimeter of 
the door. The door assembly included a 
2-ft 6-in by 6-ft 8-in airlock, one- 
person man door. 

Mockup testing was conducted in the 
laboratory, using a specially constructed 
test fixture. The test fixture consisted 
of a 12- by 16-ft plywood box (with the 
door assembly comprising one side), a fan 
for blowing air inside the box, and an 
airbag attached to the outside of the 



door side of the box for determining 
leakage through the door assembly. Fig- 
ures 1 and 2 show, respectively, the 
fire-door air-pressure test fixture with 
door assembly, man door, and fan in- 
stalled; air-pressure test-fixture with 
airbag installed. 

A manometer was used to measure air 
pressure differential across the door. 
With the fan blowing, a sliding regulator 
panel in the plywood box was adjusted 
until the desired 6-in-w.g. steady-state 
pressure differential across the door was 
achieved. 

Air leakage through the door assembly 
was determined by measuring air velocity 
through a 2.5- by 6.7-ft opening in the 
airbag. Five measurements were made, 
yielding an average velocity of 270 ft/ 
min. Total leakage through the fire 
door-man door assembly was thus 
4,523 ft 3 /min, well within the design 
goal of 8,000 ft 3 /min at 6-in-w.g. pres- 
sure differential. 

After leakage tests, the airbag was 
removed and door deflection measurements 
taken. With the doors closed, three 
lengths of mechanic's wire were stretched 
horizontally across the downstream side 
of the door assembly; one at the top of 
the doors, one at the center, and one at 
the bottom. The distance from the wire 
to the door was measured at three points 
along each wire (hinge line, center, and 
edge) for each door panel (right and 
left). After these initial conditions 
were recorded, the fan was started and 
the regulator panel adjusted to achieve 
the desired 6-in-w.g. pressure differen- 
tial across the door assembly. At this 
pressure differential, the distances be- 
tween the wires and door panels were 
remeasured and the door deflections cal- 
culated. The door deflection test 
results are summarized in table 2. Under 




HVf^- ,J| 



1 




1 




M 










FIGURE 1. — Fire-door air-pressure test fixture showing door assembly and fan. 




FIGURE 2.— Fire-door air-pressure test fixture showing airbag. 



TABLE 2. -Door deflection under conditions of 
pressure differential of 6-in w.g. , 
first-generation door 



Location of 


Door deflection, in 


measurement 


Initial 1 Fan on 


Deflection 



Top: 

Hinge. . 

Center. 

Edge. . . 
Center: 

Hinge. . 

Center. 

Edge. . . 
Bottom: 

Hinge. . 

Center. 

Edge. . . 



Top: 

Hinge. . 

Center. 

Edge. . . 
Center: 

Hinge. . 

Center. 

Edge. . . 
Bottom: 

Hinge. « 

Center. 

Edge. . . 



LEFT PANEL 



1 

6-1/8 

4-1/8 

1-1/2 
6-3/8 
4-5/16 

1-1/2 

6-3/16 

4-3/8 



5-11/16 
3-5/16 

1-1/2 
5-1/2 
2-13/16 

1-1/2 

5-5/16 

2-11/16 





7/16 
13/16 



7/8 
1-1/2 



7/8 
1-1/2 



RIGHT PANEL 



1-1/2 

5-15/16 

3-1/2 

1-1/2 

2-5/16 

3-1/2 

1-1/2 
6-1/8 
3-7/8 



1-1/2 
5-1/2 
2-11/16 

1-7/16 

1-5/8 

2-1/16 

2-1/2 

5-5/16 

2-1/8 



7/16 
13/16 

1/16 
11/16 
1-7/16 



13/16 
1-3/4 



these test conditions, equivalent to a 
load of 1.87 st distributed over the 
door's surface, the maximum deflection 
measured was 1-3/4 in. It was also dem- 
onstrated that one person, by pushing on 
one door panel, could easily open the 
door despite the 6-in-w.g. pressure dif- 
ferential. A cycling test was performed 
to identify weaknesses in the mechanical 
design of the hinge assembly and 



opening-closing mechanism. After opening 
and closing the door every 15 s for ap- 
proximately 1 h, no change in door oper- 
ating characteristics was observed. 

After successful mockup testing, the 
door was sent to UL for a 1.5-h fire rat- 
ing test. The door (without ajoining man 
door) was built into a 16-in masonry wall 
contained within a test frame (fig. 3) 
and sealed using the neoprene seals. 








FIGURE 3. — Fire-door fire-test frame with fire door installed. 



After the masonry wall had seasoned, 
the fire test was conducted in accordance 
with UL standard 10B (4_). The test frame 
was attached to a text fixture containing 
gas ports (to provide fuel for the fire) 
and thermocouples (to measure tempera- 
tures on the fire side of the door) 
(fig. 4). Temperatures within the fur- 
nace were in accordance with the standard 



time-temperature curve for fire-door 
testing (fig- 5). Throughout the fire 
test, observations were made to note the 
character of the fire and its control, 
the condition of the exposed and unex- 
posed faces, and all developments perti- 
nent to the doors as a fire barrier, with 
special reference to stability and flame 
passage (fig. 6). 








I i 



# # 



I * 



I I * 




FIGURE 4.— Fire-door fire-test fixture showing gas ports and thermocouples. 



10 




50 60 70 80 

TIME, min 

FIGURE 5. — Standard time-temperature curve for fire-door testing 



90 



100 



110 



120 



The fire was luminous and well distrib- 
uted during the fire test. Deflection of 
the doors was determined by measurements 
at about the center point of a horizontal 
wireline stretched across the midheight 
of the doors. During the first few min- 
utes of fire exposure, the doors began to 
bow away from the fire. The deflection 
at the center of the doors reached a max- 
imum of 3-1/4 in at 60 min. At 4 min, 
the faces of both doors began to buckle 
slightly. Flaming occurred along the 
neoprene seal at the meeting edge of the 
doors after 11 min, 20 s. The seal fell 
off the door after 30 s and continued to 
flame violently on the floor until extin- 
guished. After 15 min of fire exposure, 



the doors had deflected 1-1/2 in at the 
top, along the meeting edge, and in a 
direction perpendicular to the face of 
the doors. The doors continued to de- 
flect and reached a maximum of 3 in after 
60 min of fire exposure. After 25 min, 
50 s, flaming occurred along the seal at 
the top of the doors. After 26 min, 
flaming occurred at the top of the hinge 
tube on the North door. After 28 min, 
flaming also occurred along the entire 
hinge edge, and between the door and the 
fire-door frame at a point 52 in up from 
the bottom of the door. At 44 min, flam- 
ing occurred along the bottom of the 
doors on the neoprene seal. The fire 
test was halted after 60 min. 



11 








FIGURE 6.-Technician measuring door deflections during 



fire test. 



12 



At the conclusion of the fire test, it 
was determined that the door failed the 
1.5-h fire rating test because of the 
following: 

1. A 3-in deflection occurred along 
the upper meeting edge of the two 
panels. This deflection exceeded the 
of the doors and allowed the 
of flame through the door 



thickness 
passage 
(fig. 7). 
2. An 
door and 



opening occurred between the 
frame along the hinge edges 



because the neoprene seal burned away. 
SECOND-GENERATION FIRE DOOR 

The second-generation fire-door design 
was similar to the first door, however, 
changes were made to structurally rein- 
force the door panels and to improve the 
door seal using material with a higher 
fire-resistance rating. The second door 
consisted of 14-gauge sheet steel over a 
steel frame, with 5-in-wide steel channel 
welded to the skin both horizontally and 
diagonally for reinforcement. It was de- 
termined that the thinner 14-gauge steel 
would tend less toward warping the door's 
frame. A material specifically designed 
for fire doors was used for sealing 
around the edges of the panels. 

After successful mockup testing, using 
the same test fixture and procedures used 
for the original door, the second door 
was sent to UL for fire testing (fig. 8). 
The fire test procedures were identical 
to those employed during fire tests of 
the original door. The door was built 
into a 16-in-thick masonry wall contained 
within the steel test frame. After the 
wall had seasoned, the test was conducted 
in accordance with UL Standard 10B "Fire 
Tests of Door Assemblies". The fire was 
luminous and well distributed during the 
entire test. The furnace temperature was 
controlled in accordance with the stan- 
dard time-temperature curve for fire-door 
testing (fig. 5). At no time during the 
test did any of the door-panel seals show 
any signs of combustion or deterioration. 
The door panels did bow and buckle 
slightly, and a deflection along the 
meeting edge of the door panels was 
observed; however, at no time did the 



deflection exceed the thickness of the 
door, nor was flame passage through the 
door observed. As a result, this door 
successfully passed the UL Standard 10B 
1.5-h fire rating test (fig. 9). 

THIRD-GENERATION FIRE DOOR 

After testing the second-generaticn 
fire door, the following mandatory regu- 
lations were promulgated by the Mine 
Safety and Health Administration (MSHA) 
for metal and nonmetal underground mines 
(5): 

30 CFR 57.4-61A: 

To prevent the spread of smoke or 
gas in the event of a fire, venti- 
lation doors shall be installed at 
or near shaft stations of intake 
shafts and at any shaft designated 
as an escapeway under standard 
57.11-53 or at other locations 
which provide equivalent protec- 
tion. Doors constructed by this 
standard shall be constructed ac- 
cording to the specifications with- 
in the definition of "fire door" in 
section 57.2, if located in a tim- 
bered area, in an area where the 
exposed rock is combustible, or in 
an area where a significant fire 
hazard is present. 

30 CFR 57.4-61B: 



To confine or prevent the spread 
of toxic gases from a fire origi- 
nating in an underground shop, the 
mine operator shall install in each 
opening to the shop a fire door or 
bulkhead constructed in accordance 
with the definition of "fire door" 
contained in section 57.2. 

The definition of fire door con- 
tained in section 57.2 stated: 
fire door means an openable closure 
for a passageway, shaft, or other 
mine opening to serve as barrier to 
fire, the effects of fire, and air 
leakage. A fire door shall be con- 
structed of materials and assembled 
so as to be equivalent to a door 
having a fire-resistance rating of 



i 






13 




FIGURE 7.— Door deflection caused by exposure to test fire. 



14 







FIGURE 8.— Second-generation fire door undergoing fire test. 





FIGURE 9. — Second-generation fire door after removal from the fire-test fixture. 



15 



1.5 h or greater, and on exposure 
to fire on one one side for 30 min, 
the temperature on the unexposed 
side shall not exceed 250° F, as 
determined by a nationally recog- 
nized testing agency in accordance 
with "Standard Method of Fire Tests 
of Door Assemblies," National Fire 
Protection Association (NFPA) Code 
252, 1972, or equivalent. The 
framework assembly of a fire door 
and the surrounding bulkhead, if 
any, shall be at least equivalent 
to the fire door in fire and air- 
leakage resistance, and in physical 
strength. NFPA Code 252 is hereby 
incorporated by reference and made 
a part thereof. 
This definition of MSHA's performance 
requirements for a fire door differed 
from the requirements contained in the 
preproposal draft of the standard in that 
the surface temperature-rise requirement 
was added. Thus, the second-generation 
fire door failed to satisfy MSHA's per- 
formance requirements as promulgated, be- 
cause no provision had been made to limit 
the temperature rise on the surface of 
the " downf ire side of the door. In view 
of this deficiency, a third-generation 
fire door was designed to meet all 
requirements of the new definition. 

A more recent regulation, 57.4760/61, 
effective April 15, 1985 (6_), permits 
1.5-h fire doors that do not satisfy the 
250° F surface temperature requirements 
for areas of a mine that are more than 
20 ft but less than 50 ft from timbered 
areas, combustible ore, or other combust- 
ible materials. This regulation further 
states that doors greater than 50 ft from 
such combustibles need meet only the 
requirements for a ventilation door. 

The third-generation fire-door con- 
sisted of two 14-gauge sheet steel skins 
welded -to either side of a steel frame, 



reinforced with 5-in-wide steel channel. 
The interior volume of the door (between 
the sheet steel skins) was filled with a 
5-in-thick, asbestos-free mineral fiber 
insulation blanket (fig. 10). The door 
was subjected to the same deflection, 
cycling, and leakage tests as the first- 
and second-generation doors (fig. 11), 
with similar results. The door was then 
sent to UL for fire testing. 

The door was also subjected to the same 
1.5-h fire test as were the previous 
doors, however, surface temperatures were 
measured on the downfire side of the door 
in accordance with applicable provisions 
of "Standard for Fire Tests of Door 
Assemblies," UL Standard 10B. 

The fire was luminous and well distrib- 
uted during the fire test. After 3 min 
of fire exposure, the door faces began to 
buckle towards the fire between the sup- 
porting channels. 

The deflections of each panel were mea- 
sured using wires stretched across the 
opening. During the first few minutes of 
fire exposure, the doors began to bow to- 
ward the fire. The center deflection of 
the right and left panels reached a maxi- 
mum 3-1/4 in and 3-5/8 in, respectively, 
at 75 min. 

At 8 min, the top of the right panel at 
the meeting edge began to bow away from 
the fire. After 10 min of fire exposure, 
the door had deflected a maximum of 1-1/2 
in at the top and along the meeting edge 
in a direction perpendicular to the face 
of the doors. After 19 min of exposure, 
the gasketing at the meeting edge of the 
doors began to smoke. At 33 min, the 
bottom sill channel began to bow in to- 
wards the fire. A maximum deflection of 
1-1/2 in toward the fire was observed at 
70 min. At 47 min, intermittent light 
flaming was observed at the top of the 
meeting edge of the doors. This flaming 
did not exceed a 6-in length or 1-min 




FIGURE 10. — Third-generation fire-door fabrication showing thermal insulation blanket. 



duration. After 60 min, the smoke from 
the gasketing material was subsiding. At 
62 min, flaming was observed at the upper 
hinge location of the north door; how- 
ever, the flaming was contained within 
the door and did not extend past the 
plane of the door face to the unexposed 
surface. This flaming continued until 68 
min- 



During the 90-min fire-test duration no 
flaming was observed on the unexposed 
surface of the door assembly, nor through 
openings developed in the door assembly, 
and the latch remained engaged. 

Ten thermocouples were arrayed over the 
downfire side of the door (fig. 12) to 
measure surface temperatures on the un- 
exposed side of the door. 



$91 



17 




FIGURE 11. — Third-generation fire-door mockup testing. 



18 




FIGURE 12.— Thermocouples arrayed on downfire side of fire door during fire testing. 



The unexposed surface temperature was 
82° F prior to the test, and after 30 min 
of fire exposure, the average unexposed 
surface temperature rose to 158° F. The 
unexposed door-panel surface temperature 
over the entire 90-min test is shown in 
figure 13. 

The appearance of the exposed face of 
the test assembly after the fire test is 
shown in figure 14 (note the sagging 
overhead linkage). 

Based on observations of the door dur- 
ing the fire test and a thorough examina- 
tion of the door following the fire test, 
UL issued a report stating the door, 
"demonstrated suitable protection for 
openings in walls requiring 1. 5-h, 250° F 
maximum rise Fire Rated Door 
Assemblies. " 



19 



IN-MINE TEST 

Another third-generation door was in- 
stalled at the Ozark Lead Company's 
Millikan mine near Sweetwater, MO, for 
long-term endurance testing (fig. 15). 
The 16 by 11 ft door was installed in a 
20 by 14 ft main haulage drift near a 
shaft station. It functioned properly 
for approximately 6 months before being 
struck by a passing load-haul-dump vehi- 
cle. The door frame was damaged, causing 
excessive air leakage to occur. The door 
was repaired by mine personnel, except 
for the bottom seal on one panel. Ap- 
proximatly 15 months after the door was 
installed, it was evaluated for leakage 
and overall performance. At the time, 
pressure differential across the door was 



1,800 


1 


i i i i i i i i i 


I 


1.600 






- 


1,400 


yS^ 


^ — ' ^Furnace temperature 


- 




1 




- 


< 1,000 


- 1 




- 


TEMPEf 

CD 

o 
o 


- 1 




- 


600 


- 1 




- 


400 
200 




■^Surface temperature of unexposed door panel 


- 




i 




T i 


i i i i i i i i i 



10 20 30 40 50 60 70 80 90 100 110 120 

TIME, min 



FIGURE 13.— Average surface temperatures of unexposed door panels during fire test of third-generation mine fire door. 



20 





FIGURE 14. — Fire exposure side of third-generation fire door after removal from the fire-test fixture. 



less than 0. 2-in w.g. Actual leakage 
could not be measured, as proper instru- 
ments for low velocity airflow measure- 
ment were not available at the minesite. 
However, a close visual inspection of the 
door revealed no apparent leakage points 



(with the exception of the missing bottom 
seal). The door was opened and closed 
numerous times to check for signs of un- 
due wear or impaired operation. No deg-* I 
radation in door operation occurred 
during the endurance test period. 



:: 



21 




FIGURE 15.— Artist's rendering of fire door installed in underground mine. 



SUMMARY AND CONCLUSIONS 



During an underground mine fire, con- 
trolling the spread of toxic gas and 
smoke is essential. If a fire were to 
occur in an area such as a shaft station 
or shop, however, controlling the spread 
of the fire itself may be even more 
important. 



The Bureau analyzed the state-of-the- 
art of fire-door technology to determine 
the suitability of existing designs for 
underground mine use. As existing de- 
signs were found deficient, a new door, 
suitable for use in underground mines, 
was designed, fabricated, and subjected 



22 






to a 1.5-h fire rating test. This door 
failed the fire rating test due to exces- 
sive deflection of the door panels and 
the burning of neoprene edge seals. 
Therefore, a second-generation door was 
designed with greater structural integri- 
ty and fitted with seals having a higher 
fire resistance. This door successfully 
passed the UL Standard 10B fire test for 
1.5-h rated fire doors. 

A third-generation fire door was de- 
signed in response to an MSHA regulation, 
which required that fire doors be con- 
structed and assembled so as to be equiv- 
alent to a door having a fire resistance 
rating of 1.5 h or greater, and, on expo- 
sure to fire on one side, the temperature 
on the unexposed side shall not exceed 
250° F. The third-generation door was 
similar in construction to the second- 
generation door except a 5-in-thick blan- 
ket of thermal insulation was incor- 
porated into each door panel to limit 
temperature rise on the downfire side. 
When fire tested, this door satisfied 
both the fire-resistance and temperature- 
rise test criteria. Another third- 
generation door was fabricated and in- 
stalled in an operating underground mine 
for endurance testing. No design flaws 



or operating deficiencies were apparant 
after 15 months of mine use. 

The three doors developed during this 
research program represent progressively 
increasing levels of fire protection for 
underground mines. The first-generation 
door, though not suitable as a fire door, 
is an excellent ventilation door, provid- 
ing protection from the spread of smoke 
and toxic fire gases. Such doors are 
permitted under current MSHA regulations 
in areas greater than 50 ft from mine 
combustibles. The second-generation door 
also acts as a ventilation barrier and 
offers 1.5-h fire resistance as well. 
This door meets MSHA requirements for a 
fire door that is located more than 20 ft 
but less than 50 ft from timbered areas, 
combustible rock, or other combustible 
material. Finally, the third-generation 
door fulfills all requirements mandated 
by MSHA for fire doors, including 1.5-h 
fire resistance and limiting surface tem- 
peratures to 250° F for 30 min on the 
unexposed side. Where ventilation or 
fire doors are required, use of these, or 
equivalent doors, is recommended. Shop 
drawings of each door are included in the 
appendix to this report. 



REFERENCES 






1. Butani, S. J. Private communica- 
tion, 1986; available upon request from 
S. J. Butani, BuMines, Minneapolis, MN. 

2. Schoenlein, K. Evaluation of the 
Construction of Fire Doors, Air Doors, 
and Bulkheads For Noncoal Mines. Phase 
II Rep. BuMines Contract H0282003 with 
Unidynamics, Inc. 1978. Available for 
inspection at BuMines, Minneapolis, MN. 

3. Staff, Bureau of Mines. Under- 
ground Metal and Nonmetal Mine Fire Pro- 
tection. Proceedings: Bureau of Mines 
Technology Transfer Seminars, Denver, 
Colo., Nov. 3, 1981, and St. Louis, MO., 



Nov. 6, 1981. BuMines IC 8865, 1981, 
150 pp. 

4. Underwriters Laboratories. Stan- 
dard for Fire Tests of Door Assemblies, 
UL-10B 5th ed. , Chicago, IL, 1974. 

5. U.S. Code of Federal Regulations. 
Title 30 — Mineral Resources; Chapter I — 
Mine Safety And Health Administration 
Department of Labor; Subchapter N — Metal 
and Nonmetal Mine Safety and Health; Part 
57 — Safety and Health Standards, Metal & 
Nonmetal Underground Mines; July 1, 
1984. 

6. . April 15, 1985. 



INT.-BU.OF MINES,PGH.,PA. 28602 






















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.280-.293 DIA./V 22 

24 HOLES /7Y_^24 




I DRILL (.228 DIA) 
24 HOLES 



VIEW-E | D 5/2 | 
SCALE l/ 2 " 




S ECTION A-A | A6/2 
SCALE I/4" 



? Jr-V 



3rd Generation Fire Door 



UNITED STATES 
DEPARTMENT OF THE INTERIOR 

BUREAU OF MINES 



SHEET J OF 3 

All S GOVEINHEKT PRINTING OFFICE 1JH-J18 <! 




SECTION B-B ^7/2 




SECTION G-G |C4/2| 



280-.293 DIA. 
14 HOLES 




280-.293 DIA. 



SECTION C-C \cT7T \ 





SECTION H-H [btTT,, 




<fc> 






% 






SECTION F-F A8/2n 





















Third Generation Fire Door 
















,,, 


DAT. 


„«...»»«.!» 




UNITED STATES 
DEPARTMENT OF THE INTERIOR 

BUREAU OF MINES 


SCALE 




"""" 


EO 












s „ iET 2 o f 3 

ftUSMHimilNT PH1HIW OFFICE 15)1-111 tM 



NOTES 

1 VEHICLE DOOR OPENING 12' WIDE x 10' HIGH 

2 AIR REQUIREMENTS: 2 CFM at 90 PSIG 

A. POWER REQUIREMENTS! 120 VOLT, SINGLE PHASE, 60 CYCLE 

AND"! AMP 

3 DESIGNED FOR DIFFERENTIAL PRESSURE 6" WATER WITHOUT 
EXCEEDING 35% MATERIAL YIELD STRENGTH. 

TO BE DESIGNED TO PASS UL TYPE-FIRE TEST 250° TEMP. RISE 
DESIGN LIFE WITHOUT MAJOR OVERHAUL 204,000 CYCLES OR 5 YEARS 



USE PART TO BE MOUNTED AS A HOLE PATTERN 

TO BE ADJUSTED SO CYLINDER BOTTOMS WHEN DOORS ARE OPEN 90° 

ADJUST FOR PROPER SPACING BY CLOSING BOTH DOORS (ITEMS I a 2) 

UNTIL EACH DOOR IS PARALLEL TO ITEM 7. 

MATERIAL R/M 604 NM-NEOPRENE COATED CLOTH MAY BE PURCHASED FROM 

RM ENGINEERED PRODUCTS, INC. 

RO. BOX 5205 N. CHARLESTON S.C. 
29406 

TRIM END AS REQUIRED FOR CLEARANCE 

PRESS TIP OF SEAL AGAINST MATING SURFACE UNTIL SEAL BEGINS TO 

BUCKLE AND FASTEN TO THIS POSITION 

REMOVE BURRS AND BREAK SHARP EDGES 

VISUALLY INSPECT WELDS 

/s\ FILL INTERIOR VOLUME OF DOOR PANELS WITH 5" THICK THERMAL 
INSULATION BLANKET. MATERIAL AVAILABLE FROM 

THE CARBORUNDUM CO., INSULATION DIVISION 
PO BOX 808 

NIAGARA FALLS, NEW YORK 14302 
(SPECIFY FIBERFAX DURABLANKET 4lb/ft 3 ) 






























QTY. 


ITEM| PART NO. 1 DESCRIPTION | MATL/SPEC | MANUFACTURER 




PARTS LIST 


AR 


50 


12821951-21 


5" OD x 3'/ 2 ID x l/ 8 TH 


A\ 1 


10 


49 


'/ 4 20UNC-2AX l/ 2 


SCREW, SELF TAPPING-TYPE F 


HEX HD |STL ZINC PLD COML. 


2 


48 


GP 34 ,375x 1.750-10 


GROOVE PIN 




GROOVE PIN CORP. 


2 


47 


12821582-2 


HANDLE 






1 


46 


12821951-18 


'/ 8 X7 x M7 '/a 


A 




4 


45 


12821951 - II 


'/ 8 x5'/ 2 x 121 


/lo\ 




4 


44 1 12821501 - 15 


FLAT 






26 


43 


'/4-20 UNC-2AXI 


SCREW, SELF TAPPING-TYPE F 


STL. ZINC PLD 


COML 


14 


42 


'/4 NOM 


WASHER, BEVELED 


STL. ZINC PLD 


COML 


2 


41 


FFI505-5 


FLANGE BEARING (I'AID x i/ 2L G) 




OILITE 


1 


40 


12821582-3 


COVER 






2 


39 


'/I6DIA x I/4 LG 


COTTER PIN 


STEEL 


COML 


2 


38 


II47AII 


160 FUSIBLE LINK (2516) 


U.L. APVD 


MCMASTER CARR 


1 


37 


12821582- 1 


LATCH 






1 


36 


12821501 - 14 


FLAT 






4 


35 


HC-1050 


SINGLE BOLT RING CLAMP 




DAYCO 


10 


34 


9LI 


LOW PRESSURE HOSE 




DAYCO 


4 


33 


S5-4-MHC -45 


MALE HOSE CONNECTOR 




CAJON 


2 


32 


S-4-SE 


STREET ELBOW 


STEEL 






2 


31 


S-4-ME 


MALE ELBOW 


STEEL 




i 


2 


30 


S-8-RB-4 


REDUCER BUSHING 


STEEL 


CAJON 


24 


29 


V 4 -20UNL-20 x l 3 / 4 


BOLT, HEX HD 


STL. ZINC PLD 


COML 


1 


28 


12821951-11 


ANGLE 2'/ 2 x2V 2 x 3 / l6 x 5 


M 1020 


STEEL 


2 


27 


F400B 


FLOW CONTROL VALVE 




MANATROL 


1 


26 


826 B-IIIC-612 


4-WAY AIR VALVE 




MAC 


8 


25 


5 /8 NOM 


LOCK WASHER, HELICAL 


STL. ZINC PLD 


COML 


3 


24 


HG-567 


PIN 




S.P. MFG. CO. 


5 


23 


BG-538 


ROD CLEVIS 




S.P. MFG.CO. 


66 


22 


l/ 4 -20UNC-2B 


NUT, HEX, SELFLOCKING 


STL. ZINC PLD 


COML 


1 


21 


12821300-16 


TIE ROD CONNECTOR 






4 


20 


'/2 NOM 


BEVELED WASHER 


STEEL 


COML 


2 


19 


12821501-2 


LOWER DOOR SEAL 






2 


18 


12821 501-1 


UPPER DOOR SEAL 






2 


17 


1282150. -16 


ANGLE 






8 


16 


5 /r-I 1 UNC-2B 


NUT, HEX, SELFLOCKING 


STL. ZINC PLD 


COML 


16 


15 


5 /b-I1 UNC-2A-2LG 


BOLT, HEX, HD 










8 


14 


V ? -I3UNC-2B 


NUT, HEX, SELFLOCKING 










8 


13 


l / 2 -l5UNC-2Ax|3/ 4 


BOLT, HEX HD 








_ 


31 


12 


V 4 -20UNC-2A x 3 / 4 


SCREW, SELF TAPPING-TYPE F 










2 


II 


I-8UNC-2B 


NUT, HEX JAM 


STL. ZINC PLD 


COML 


1 


10 


12821300-5 


SUPPORT ROD AIR CYLINDER 






16 


9 


'/4-20UNC-2Ax|'/2 


BOLT, HEX HD 


STL ZINC PLD 


COML 


4 


8 


SCM-2" BORE 


FLANGE BEARING-4 BOLT 




DODGE 


1 


7 


12821951-3 


LOWER SUPPORTING FRAME 






2 


6 

5 


12821951-10 
12821300-2 


UPPER SUPPORTING FRAME 






1 


4 


12821300-1 


DOOR TIE ROD 

AIR CYLINDER end-port position n„.2 


S.P. MFG. CO. 


1 
I 


2 

1 


I282I0I3-I 
12821013-2 


DOOR ASSEMBLY 
DOOR ASSEMBLY 













MINE FIRE DOOR 



















it, 


OATE 


OESCR.PT.ONOEF-EV.S.ON 




DRAWN 


UNITED STATES 
DEPARTMENT OF THE INTERIOR 

BUREAU OF MINES 


SCALE 




_CHECKEO__ 




















SHEET 3 "3 
aUSStMSKBEin PRIHTIME OFFICE ISTF-HI-IH 




notes: 

i vehicle door opening 12' wide x |0' high. 

2 man door opening 2-6" wide»6'-b" high. 

3 AIR REQUIREMENTS! 2 C.F.M. at 90 PSIG. 
3A POWER REQUIREMENTS: 120 VOLT, SINGLE PHASE. 

60 CYCLE 4- 1 AMP. 

4 DESIGNED FOR DIFFERENTIAL PRESSURE OF 6" WATER. 
WITHOUT EXCEEDING 35% MATERIAL YIELD STRENGTH. 

5 TO BE DESIGNED TO PASS U.L.TYPE S l'/ 8 HOUR 
FIRE RATING TEST. 

6 DESIGN LIFE WITHOUT MAJOR OVERHAUL 201,000 
CYCLES OR 5 YEARS. 

7 AIR LEAKAGE NOT TO EXCEED 8000 C.F.M. AT 6" WATER 
. DIFFERENTIAL PRESSURE. 

AuSE PART TO BE MOUNTED AS A TEMPLATE FOR THE 

HOLE PATTERN. 
£^T0 BE ADJUSTED SO CYLINDER BOTTOMS WHEN 
DOORS ARE OPEN 90° 

NEOPRENE COATED FABRIC AVAILABLE FROM 
R.M. ENGINEERED PRODUCTS INC. 
PO BOX 5205, NORTH CHARLESTON S.C., 29406 
SPECIFY - . RM 604 NM 



TRIM END AS REQUIRED FOR CLEARANCE. 

PRESS TIP OF SEAL AGAINST MATING SURFACE 

UNTIL SEAL BEGINS TO BUCKLE AND FASTEN IN 

THIS POSITION. 

LOCATED AT CUSTOMERS OPTION 

DOOR OPEN/DOOR CLOSED SWITCHES LOCATED 

AT CUSTOMERS OPTION 



S REF 
'|6)#l DRILL (.228 DIA) 
3 HOLES 
43 REF/-N3 



BULKHEAD PANELS WILL BE 
FIT TO CUSTOMERS NEEDS 



\ 



8"* MINE DRAINAGE LINE 



OTY. 


ITEM| PART NO. 1 DESCRIPTION 


MATL/SPEC | MANUFACTURER 






PARTS LIST 




24 


83 


1/4-20 UNC-2AXI3/4 


BOLT HEX HD 


STEELZINCPL 


COML. 


1 


82 


12821201-16 


AN6LEl/4X|x|l/ 4 


ASTM A36 


STEEL 




26 


81 


1/4-20 UNC-2AXM/4 


BOLT HEX HD 


STEELZINCPL 


COML 




2 


80 


CI7 


CONDUIT BOX 




GRAYBAR 




2 


79 


1/2-14 NPT 


NIPPLE, CONDUIT, CLOSE 




GRAYBAR 




14 


78 


1/4 -NOM. 


WASHER, BEVELED 


STEELZINCPL 


COML. 




1 


77 


1/2-14 NPT 


ELBOW, 90° FEMALE 


STEELZINCPL 


COML. 




1 


76 


I/2-I4NPTX2LG 


NIPPLE 


STEEL 


COML. 




AR 


75 


12821201-15 


5"0DX3"IDX 1.8" TH 


A 






4 


74 


12821201-14 


HINGE SEAL 


A 


RM ENGINEERED PROD 




2 


73 


1/32 DIA 20" 


SEIZEING WIRE 




COML. 




2 


72 


l /4" DIAX|"LG 


SPRING PIN 


PLT'D..STL 


COML. 




2 


71 


l/4"DIAXI0'LG 


NYLON ROPE 




COML. 




12 


70 


1/2" NOM 


FLAT WASHER 


ZINCPLT'DSTl 


COML. 




3 


69 


12821700-1 


CEILING ADAPTER 








1 


68 


LI00WDL-2M W 9 


LIMIT SWITCH 




R.B. DENISON 




2 


67 


12821201-13 


ANGLE 2x2x3/|6xl8 


M-1020 


STEEL 




14 


66 


'/4-20UNC-2AX 1 


'BOLT, FLAT HD-SLOTTED-82 


ZINCPLT'DSTl 


COML. 




4 


65 


I/4-20UNC-2AX3/4 


BOLT, HEX HD 


ZINC PLT'DSTL 


COML. 




4 


64 


2270 


90" ANGLE CONNECTOR 




T*B 




3 


63 


2523 


STRAIGHT CONNECTOR 




T*B 




30' 


62 


DSGA-3 CA-8 


CABLE STRIP LENGTH I2'V6" 




COML. 




30' 


61 


DSGA-3 CA-7 


CABLE STRIP LENGTH I2"*6" 




COML. 




15' 


60 


DSGA-3 CA-6 


CABLE STRIP LENGTH I2"*6" 




COML. 




16' 


59 


DSGA-3 CA-5 


CABLE STRIP LENGTH 12"* 6" 




COML. 




6' 


58 


FSGA-3 CA-4 


CABLE STRIP LENGTH I2>6" 




COML. 




22' 


57 


FSGA-3 CA-3 


CABLE STR 1 P LENGTH 1 Z% 6" 




COML. 




14' 

1 


56 
55 


DSGA-3 CA-2 
12821205-1 


CABLE STRIP LENGTH 12"*- 6" 
MINE DOOR CONTROLLER 




COML. 




2 


54 


KA 


LEVER 




R.B. DENISON 




2 


53 


FC 


LEVER 




R.B. DENISON 




1 


52 


LIOOWDR-2MN0.5 


LIMIT SWITCH 




R.B. DENISON 




2 


51 


LI00WS-2M No.! 


LIMIT SWITCH 




R.B. DENISON 




4 


50 


HC-1050 


SINGLE BOLT RING CLAMP 




DAYCO 




10' 


49 


4LI 


LOW PRESSURE HOSE 




DAYCO 




4 


48 


SS-4-MHC-4S 


MALE HOSE CONNECTOR 




CAJON 




2 


47 


S-4-SE 


STREET ELBO 


STEEL 


CAJON 




2 


46 


S-4-ME 


MALEELBO 


STEEL 


CAJON 




2 


45 


S-8-RB-4 


REDUCER BUSHING 


STEEL 


CAJON 






44 


/4-20UNC-2AXM/2 


BOLT, HEX HD 


ZINCPLT'DSTL 


COML. 




3 


43 


12821201-12 


ANGLE 2'/2x2'/2x3/|6X5 


M-1020 


STEEL 




2 


42 


F400 B 


FLOW CONTROL VALVE 




MANATROL 




1 


41 


826 B-HIC-612 


4-WAY AIR VALVE 




MAC 




1 


40 


349 


WEATHER PROOF BACK BOX 




EDWARDS SIGNALING 




| 


39 


874-120 VOLT 


ADAPTAHORN 




EDWAROS SIGNALING 




4 


38 


5/8 NOM 


LOCKWASHER HELICAL 


ZINCPLT'DSTL 


COML. 




4 


37 


/2 NOM 


LOCKWASHER HELICAL 


ZINCPLT'DSTL 


COML. 




3 


36 


HG-567 


PIN 




S.P. MFG. 




3 


35 


BG-538 


ROD CLEVIS 

COLOR 
ADHESIVE SEALENT, TRANSLUCENT 




S.P. MFG. 




AR 


34 


NO 532 SILASTIL 




DOW CORNING 




182 


33 


/4-20UNC-2B 


NUT, HEX SELFLOCKING 


ZINC PLT'D STL 


COML. 




? 


32 


P-10354 186" 


GASKET "E" PATTERN 


VINYL 


J.B. IND, 




2 


31 


12827500-4 


PASSAGE DOOR, LOWER AIR SEAL 


A 


RM ENGINEERED PRO 




20 
1 


30 
29 


/2l3UNC-2AX|l/ 2 
12821300-16 


BOLT, HEX HD 
TIEROD CONNECTOR 


ZINC PLT'D STL 


COML. 




1? 


28 


1/2" NOM 


BEVELED WASHER 


STEEL 


COML. 




1 


27 




HINGE SEAL 


A 


RM ENGINEERED 




7 


?6 


7 HT 2.5X15' 


7"C" SECTION 




INRYCO 




2 

2 


25 
24 
23 


I282;50-I 


LOWER DOOR SEAL 


A 




RM ENGINEERED PROD 




1282150-16 




8 


?? 


5/e-ll UNC -28 


NUT, HEX SELF LOCKING 


ZINC PLT'D STL 


COML. 




1 


21 


1282120-16 


SHEET II Ga.(J20)x20x36 3 / e 


LOW CARBON 


STEEL 




16 


?n 


5/ 8 -ll UNC-2AX2"LG 


BOLT HEX HO 


ZINCPLT'DSTL 


COML. 




26 


19 


I/2-I3UNC-2B 


NUT, HEX SELF LOCKING 


ZINCPLT'DSTL 


COML. 




2 


18 


1282150-2 


UPPER DOOR SEAL 


A 


m ENGINEERED PROD. 




14 


17 


I/2-I3UNC2AXI3/4 


BOLT, HEX HD 


ZINC PLT'D STL 


COML. 




38 




I/4-20UNC2AX3/4 


SCREW, TYPE-F, SELF TAPPING HEX HD 


ZINCPLT'DSTL 


COML. 




2 
1 


15 
14 


4-8UNC-28 

12821300-5 


MUT, HEX, JAM, ZINC PL. 
SUPPORT ROD-AIR CYLINDER 


STEEL 


COML. 




38 


13 


l/ 4 -20UNC-2AX 1 
12821600-1 


BOLT, HEX HO 

AIR LOCK HALLWAY 


ZINCPLT'DSTL 


COML. 




4 

1 
1 


II 

9 
8 

7 
6 


SCM-2"B0RE 

12821300-4 
1282 1400-1 
1282 1300-14 
12821500-2 


FLAN6E BEARING, 4 BOLT 

LOWER SUPPORTIN FRAME 
LEFT SIDE SUPPORT FRAME 
RT.SIDE SUPPORT FRAME 




DODGE 




1 


UPPER SUPPORT FRAME 








1 


5 


12821300-1 
A3G5"-I5"-CC 


DOOR TIE -ROD 

... * v . 1K , ncD 2 HOD DIA. WITH 1.5-12 
AIR CYLINDER male ROD END 




SP MFG 




2 

I 


3 


12821250-1 
128210 


PASSAGE DOOR 
DOOR ASSEMBLY 








1 


| 1 


1282100 


DOOR ASSEMBLY 











2nd Generation Fire Door 




















DRAWN 


UNITED S 
DEPARTMENT OF 

BUREAU O 


TATES 






SCALE 




("HE interior 

F MINES 






CHECKED 










SHEET 1 OF 4 


















ISO- 



NOTES: 

1 REMOVE BURRS, BREAK ALL SHARP EDGES 

2 VISUALLY INSPECT WELDS 



REMOVE ALL FOREIGN MATTER. MILL SCALE, RUST, WELD SPLATTER 
ETC., AND APPLY TWO COATS OF TT-P-645, ZINC CHROMATE PRIMER 

CLEAN SURFACES TO BE PAINTED, THEN APPLY ONE (I) COAT 
MIL-E-ISI300C ENAMEL PAINT, HAZE GRAY, N0.5H 

OMIT PAINT FROM THESE SURFACES 

TRIM FLANGE OF ITEM 7 TO FIT OVER ITEM 6, IF REQUIRED 



REVISION STATUS OF SH 



SHI SH2 SH SH 



INCORPORATED EDCO 



P£[E APPROVED 




23 
22 
21 
20 
19 

ie 

17 
16 
15 
14 
13 
12 
II 
10 
9 
8 
7 
6 
S 
4 
3 
2 
I 
ITEM 



I282IO0I- 27 
12821001-26 
12821001-25 
12821001-24 
12821001-23 
12821001-22 
12821001-21 
12821001-20 
I282IOOI -19 
12821001-18 
12821001-17 
12821001 -16 
12821001-15 
1 2821001 -14 
12821001 -13 
12821001-12 
12821001 -II 
12821001- 2 
12821050-2 
12821001 -10 
12821000-12 
12821000-11 
12821000-10 



PART NO. 



CHANNEL 5X6.7 #/FT 693/4" 
ANGLE l/4"»2-l/2"x2'^/2'l(7r^l/2" 
FLAT3/8'x4l(4"xl2 
FLAT3/ 8 "x 4"x7" 
ANGLE IWs|lA"«l/4Xll4" 
ANGLE |l/ 2 x| 1/2 xifcx 31 K, 
ANGLE |l/ 2 "x |l/ 2 x l/a" K 16 
CHANNEL 5'X6','7#/FTX||53/4" 
CHANNEL 5'X6','7#/FTX723/| 6 " 
ANGLE l/ 4 x2l/ 2 "x2l/2"x7l/2" 
CHANNEL 5'x 61' 7#/FTX|5/ 8 " 
CHANNEL 5'X6;'7#/*FTX 5" 
CHANNEL 5'x 6',' 7#/FT« 6" 
FLAT l /4'x|9/l6 , X45/8" 
CHANNEL 5'XG;'7#/FTX 653/n" 
CHANNEL 5X6','7#/FTX723/|6" 
CHANNEL S^^ltf/ FTX693/4" 
ACTUATOR ARM 
ACTUATOR ARM 579/16" 
SHEET I4GAx733 / 4,"x||5'/4" 
BAR 
BAR 
TUBE 



DESCRIPTION 



PARTS LIST 



A36 


STEEL 


A36 


STEEL 


Ml 020 


STEEL 


MI020 


STEEL 


A36 


STEEL 


A36 


STEEL 


A3 6 


STEEL 


A36 


STEEL 


A3 6 


STEEL 


A36 


STEEL 


A36 


STEEL 


A36 


STEEL 


A36 


STEEL 


MI020 


STEEL 


A36 


STEEL 


A36 


STEEL 


A36 


STEEL 



LOW CARBON STEEL 



MATL/SPEC MFG 



TYP-3 SIDES\ 

2 -PL ' 




UNITED STATES 
DEPARTMENT OF THE INTERIOR 

BUREAU OF MINES 



U S GOVCRKMEHT PRtNIIKC OFFICE 19T7-JT8 47 



[33) .280-. 293 DIA. 

J 6 4 64 HOLES 
! 65 ) 




SECTION C-C fpeTT) 
scale i/-" 



_J*EF TWO BOLTS PER PANEL, 

BOTH ENDS _ .280-.293 DIA. 
3 HOLES 





REF 

.280-. 293 DIA. 13 HOLES 
R EP 2 PLACES 



SECTION H-H |E47T1 



REF SCALE l/ 4 " 



I* REF 

280-.293 DIA. 




82" COUNTERSINK 
TO .507-. 520 DIA 
14 HOLES ON 12" CENTERS 



#1 DRILL!. 228 DIA) 
3 HOLES 



SECTION D-D~rD~57T1 

SCALE I/4" 




44) 

.280-. 293 DIA. 
8\ 14 HOLES 



SECTION A-A [TiTT] 

SCALE l/ 4 " 



SECTION B-B [b 6/1 1 

SCALE I/4" 



SECTION G-G lB~77n 

SCALE It" 



.280-. 293 DIA., 24 HOLES 
REF 




DETAIL F-F |g4/T] 

SCALE l/ 4 " 




DETAIL E-E [g77T| 

SCALE I/4" 



.280-293 DIA 
3 HOLES 




DETAIL L [C77T| 

SCALE V4" TYP6-N 




SCALE 3 /. 




SECTION K-K |B7/| I 

SCALE 3 /e 




SCALE 3 / B " TYPICAL 6 PLACES 



2nd Generation Fire Door 



UNITED STATES 
DEPARTMENT OF THE INTERIOR 

BUREAU OF MINES 



^U S GQVERNHEHI MINTING CFFICt 1917-170 4! 




SECTION E-E [esTTI 

SCALE I/4 




SECTION D-D [Em] 

SCALE I/4" 



SECTION A- A |c7/i 

SCALE I/4" 



H~~ REF ~*| 



-653/"- 



^ 



13/4- 



-|3/ 4 " REF 



vU l3 ° 



]r 



J 



© 



12821001-13 [E47T 



SCALE W 



*i r 



-723/16- 



V' 



ic 





3 /4 REF 



REF 
I6)5"CHANNEL 



SECTION B-B [piTT] 

SCALE l/ 4 " 



f-1 3 /; 



w. 



(7) 12821001-12 |bs/i |b4/i| 

SCALE I/4" 




! 1 



-SLOT POSITION 
TYP. BOTH DOORS 




~w^r 



4 <« 



VIEW F-F |cs7T1 

SCALE l/ 4 " 




SECTION C-C |D4/l| 

SCALE I/4" 



Q 



i3 



za 



® 



12821001-23 [eITT 



SCALE V4" 



K-|3/ 4 REF 



7'/ 8 " 



31 



»l.9 t-*H II 



-1153/4- 



:?□ 



-1^ 



fis) 12821001-20 |cs/i I p/5 | 

SCALE l/a" 



-V 



© 



Dm? 

i3°^y 



I 3/4 



12821001-19 |B6/i|A5/i| 

SCALE I/4" 



-1 3/4 



l 9 /|6 

r . 



5 
REF 







12821001-16 [1777 



SCALE l/ 2 



-43/-"- 



3 / B ^l 



\% 



-35/ 8 - 



'/4_ 

REF 



/^\ 12821001-14 |F6/l I F5/I I 



SCALE 1/4" 



I l5 / lf 
l3 /|6- 



T 



■2'/; 



2" U- 



8I/4 

12" 



-71 1/,' 



(14) 12821001-18 I E 7/1 I SHOWN 
(22) 12821001-26 I E4/ 1 I OPPOSITE 
^^^ SCALE I/4" 



1 3/4 



T„ 
4 1/4 

1 



-3/4 



U-3 A 



(J) 12821001-25 |C6/2|B6/2| 
SCALE I/4" 



2nd Generation Fire Door 



J 



UNITED STATES 
DEPARTMENT OF THE INTERIOR 

BUREAU OF MINES 



SMvBSKtMIMIIIIB OFFIti. I917-7JMH 



